A teenager wakes up bonded to an alien weapon he can't remove, and the OVA doesn't waste time pretending this is cool. The violence is graphic enough to make you feel the weight of what's happening to Sho's body, not just watch it happen. This is raw adaptation work from 1986, before the franchise learned how to polish itself, and that rawness is exactly what makes the early manga's horror stick.
A high school student's life shatters the moment he stumbles onto an alien artifact in the darkness. Sho Fukamachi awakens to find his body merged with the Guyver, a biomechanical weapon of unknown origin that transforms him into something far more than human. The fusion grants him devastating power, but the cost is immediate and brutal. Shadowy forces hunt him relentlessly, and those closest to him become targets. When assassins strike down his friends without hesitation, Sho confronts the horrifying reality of his new existence: wearing this armor means watching everyone around him suffer. Caught between the need to protect his girlfriend and the overwhelming desire to survive, Sho must master a weapon he never wanted while piecing together what the Guyver actually is. Other enhanced soldiers emerge as rivals, each bearing their own alien suits and their own agendas. Action erupts constantly, blending sci-fi spectacle with genuine body horror and psychological torment. This is a brutal introduction to a world where one wrong turn can strip away your humanity and leave only a living weapon behind.